Solid phase
Official name
Magnesium(II) sulfate undecahydrate
Secondary names
Magnesium sulphate undecahydrate
Type
Family
ionic solid
Class
normal salt
Compound type
sulfate
Comments
Magnesium sulfate undecahydrate occurs as a mineral: Meridianiite
Chemical composition
Formula
$Mg^{2+} \cdot SO_4^{2-} \bullet 11H_2O$
Chemical formula
MgSO4•11H2O
Elemental formula
(Mg2+) S O13 (O-)2 H22
Isotope mixture type
terrestrial abundance
26.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Mg^{2+}$ Magnesium(II) cation element 1 0.07692307692307693 1 constituent cation main
$(SO_4)^{2-}$ Sulfate anion chemical function 1 0.07692307692307693 1 anionic radical main
$H_2O$ Water molecule 11 0.8461538461538461 1 hydration main
Chemical functions
  Function Number
$(SO_4)^{2-}$ 1
$R-OH$ 2
Chemical bonds
  Bond Number
$\cdot Mg^{2+} \cdot O^{-}-$ 2
$-O \dots H-$ 22
$-O-H$ 2
$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$ 4
Class
normal salts (07)
Type
hydrated simple normal salts (07.04)
Equivalent mineral
Meridianiite
Phase type
crystalline
Crystal system
triclinic
Crystal class
pinacoidal
Crystal class symbol
-1 (Ci)
Crystal spacegroup
P-1
Molar mass
318.55 $g/mol$
Density
1.512 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid MgSO4.7H2O + H2O above 2°C (275 K)
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.030
Refraction index $n_{\alpha}$
1.418
Refraction index $n_{\gamma}$
1.448
Dispersion V
none
Pure color
colorless
Color
colorless, white
Diaphaneity
transparent
Luster
vitreous
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